10-25-2011, 01:08 PM
oxn316 Wrote:no it was last week, temp were around 55-60 degrees.
Once you get down below 50 in my experience you see a big drop off. I was shooting a match at the weekend and found that I was 3 MOA below my summer impact points between 600 and 1000 yds. I just didn't think that temperature was going to have such a huge impact on my dope. Conversely if you compare the 6mm AR Turbo 40 Improved, a Grendel wildcat, and run the numbers it's way more effective. You can run a 6mm Berger 108 gr bullet at slower speeds than the same weight 6.5mm Scenar and be supersonic further down range. The Turbo 40i is definitely the way to go if your looking to reliably engage 900 + yds targets across the temperature spectrum. The Grendel is great to about 900 but that's where it ends IMO.